diff --git a/foo.improv b/foo.improv
new file mode 100644
index 0000000..464b737
--- /dev/null
+++ b/foo.improv
@@ -0,0 +1,4562 @@
+{
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+        [
+          "Month",
+          "Feb"
+        ],
+        [
+          "Recipient",
+          "Jane"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Gas"
+        ]
+      ],
+      {
+        "Number": 23443.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Feb"
+        ],
+        [
+          "Recipient",
+          "Alice"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Food"
+        ]
+      ],
+      {
+        "Number": 86940.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "May"
+        ],
+        [
+          "Recipient",
+          "Alice"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Food"
+        ]
+      ],
+      {
+        "Number": 673.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Mar"
+        ],
+        [
+          "Recipient",
+          "Joe"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Gas"
+        ]
+      ],
+      {
+        "Number": 3404.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Mar"
+        ],
+        [
+          "Recipient",
+          "Alice"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Medical"
+        ]
+      ],
+      {
+        "Number": 23456.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Jun"
+        ],
+        [
+          "Recipient",
+          "Alice"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Clothing"
+        ]
+      ],
+      {
+        "Number": 40.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Jun"
+        ],
+        [
+          "Recipient",
+          "Alice"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Medical"
+        ]
+      ],
+      {
+        "Number": 653.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "May"
+        ],
+        [
+          "Recipient",
+          "Jane"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Food"
+        ]
+      ],
+      {
+        "Number": 3434.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Apr"
+        ],
+        [
+          "Recipient",
+          "Bob"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Gas"
+        ]
+      ],
+      {
+        "Number": 2937.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Jan"
+        ],
+        [
+          "Recipient",
+          "Joe"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Gas"
+        ]
+      ],
+      {
+        "Number": 12.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Feb"
+        ],
+        [
+          "Recipient",
+          "Joe"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Gas"
+        ]
+      ],
+      {
+        "Number": 4343.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Mar"
+        ],
+        [
+          "Recipient",
+          "Jane"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Medical"
+        ]
+      ],
+      {
+        "Number": 463.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Jun"
+        ],
+        [
+          "Recipient",
+          "Joe"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Food"
+        ]
+      ],
+      {
+        "Number": 353.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "May"
+        ],
+        [
+          "Recipient",
+          "Joe"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Food"
+        ]
+      ],
+      {
+        "Number": 34.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "May"
+        ],
+        [
+          "Recipient",
+          "Jane"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Clothing"
+        ]
+      ],
+      {
+        "Number": 9683.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Jun"
+        ],
+        [
+          "Recipient",
+          "Joe"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Gas"
+        ]
+      ],
+      {
+        "Number": 83.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Feb"
+        ],
+        [
+          "Recipient",
+          "Joe"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Clothing"
+        ]
+      ],
+      {
+        "Number": 83.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Mar"
+        ],
+        [
+          "Recipient",
+          "Jane"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Food"
+        ]
+      ],
+      {
+        "Number": 564373.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Apr"
+        ],
+        [
+          "Recipient",
+          "Alice"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Gas"
+        ]
+      ],
+      {
+        "Number": 5645543.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "May"
+        ],
+        [
+          "Recipient",
+          "Bob"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Clothing"
+        ]
+      ],
+      {
+        "Number": 343.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Jun"
+        ],
+        [
+          "Recipient",
+          "Bob"
+        ],
+        [
+          "Signer",
+          "Bernadette"
+        ],
+        [
+          "Type",
+          "Medical"
+        ]
+      ],
+      {
+        "Number": 3453.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Jun"
+        ],
+        [
+          "Recipient",
+          "Jane"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Gas"
+        ]
+      ],
+      {
+        "Number": 9204.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "Jun"
+        ],
+        [
+          "Recipient",
+          "Alice"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Clothing"
+        ]
+      ],
+      {
+        "Number": 4032.0
+      }
+    ],
+    [
+      [
+        [
+          "Month",
+          "May"
+        ],
+        [
+          "Recipient",
+          "Joe"
+        ],
+        [
+          "Signer",
+          "Ed"
+        ],
+        [
+          "Type",
+          "Medical"
+        ]
+      ],
+      {
+        "Number": 2930.0
+      }
+    ]
+  ],
+  "formulas": [],
+  "views": {
+    "Default": {
+      "name": "Default",
+      "category_axes": {
+        "Type": "column",
+        "Month": "row",
+        "Recipient": "column",
+        "Signer": "page"
+      },
+      "page_selections": {
+        "Recipient": "Jane",
+        "Signer": "Ed"
+      },
+      "hidden_items": {},
+      "collapsed_groups": {},
+      "number_format": ",.0",
+      "row_offset": 0,
+      "col_offset": 0,
+      "selected": [
+        0,
+        0
+      ]
+    }
+  },
+  "active_view": "Default",
+  "next_category_id": 4
+}
\ No newline at end of file
diff --git a/src/ui/app.rs b/src/ui/app.rs
index 507e187..9f81263 100644
--- a/src/ui/app.rs
+++ b/src/ui/app.rs
@@ -219,9 +219,11 @@ impl App {
             (KeyCode::Char('d'), KeyModifiers::CONTROL) => { self.scroll_rows(5); }
             (KeyCode::Char('u'), KeyModifiers::CONTROL) => { self.scroll_rows(-5); }
 
+            // Enter = advance (down, wrapping to top of next column)
+            (KeyCode::Enter, _) => { self.enter_advance(); }
+
             // ── Editing ────────────────────────────────────────────────────
-            (KeyCode::Enter, _)
-            | (KeyCode::Char('i'), KeyModifiers::NONE)
+            (KeyCode::Char('i'), KeyModifiers::NONE)
             | (KeyCode::Char('a'), KeyModifiers::NONE) => {
                 let current = self.selected_cell_key()
                     .and_then(|k| self.model.get_cell(&k).cloned())
@@ -1107,10 +1109,33 @@ impl App {
         self.mode = AppMode::ImportWizard;
     }
 
+    /// Advance selection down one row; when at the last row, wrap to row 0 of
+    /// the next column (typewriter-style). Does nothing if the grid is empty.
+    pub fn enter_advance(&mut self) {
+        let (row_max, col_max) = {
+            let layout = GridLayout::new(&self.model, self.model.active_view());
+            (layout.row_count().saturating_sub(1), layout.col_count().saturating_sub(1))
+        };
+        let view = self.model.active_view_mut();
+        let (r, c) = view.selected;
+        let (nr, nc) = if r < row_max {
+            (r + 1, c)
+        } else if c < col_max {
+            (0, c + 1)
+        } else {
+            (r, c) // already at bottom-right; stay
+        };
+        view.selected = (nr, nc);
+        if nr < view.row_offset { view.row_offset = nr; }
+        if nr >= view.row_offset + 20 { view.row_offset = nr.saturating_sub(19); }
+        if nc < view.col_offset { view.col_offset = nc; }
+        if nc >= view.col_offset + 8 { view.col_offset = nc.saturating_sub(7); }
+    }
+
     /// Hint text for the status bar (context-sensitive)
     pub fn hint_text(&self) -> &'static str {
         match &self.mode {
-            AppMode::Normal => "hjkl:nav  i:edit  x:clear  /:search  F/C/V:panels  T:tiles  [:]:page  ::cmd",
+            AppMode::Normal => "hjkl:nav  Enter:advance  i:edit  x:clear  /:search  F/C/V:panels  T:tiles  [:]:page  ::cmd",
             AppMode::Editing { .. } => "Enter:commit  Esc:cancel",
             AppMode::FormulaPanel => "n:new  d:delete  jk:nav  Esc:back",
             AppMode::FormulaEdit { .. } => "Enter:save  Esc:cancel  — type: Name = expression",
@@ -1126,3 +1151,45 @@ impl App {
     }
 }
 
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::model::Model;
+
+    fn two_col_model() -> App {
+        let mut m = Model::new("T");
+        m.add_category("Row").unwrap();    // → Row axis
+        m.add_category("Col").unwrap();    // → Column axis
+        m.category_mut("Row").unwrap().add_item("A");
+        m.category_mut("Row").unwrap().add_item("B");
+        m.category_mut("Row").unwrap().add_item("C");
+        m.category_mut("Col").unwrap().add_item("X");
+        m.category_mut("Col").unwrap().add_item("Y");
+        App::new(m, None)
+    }
+
+    #[test]
+    fn enter_advance_moves_down_within_column() {
+        let mut app = two_col_model();
+        app.model.active_view_mut().selected = (0, 0);
+        app.enter_advance();
+        assert_eq!(app.model.active_view().selected, (1, 0));
+    }
+
+    #[test]
+    fn enter_advance_wraps_to_top_of_next_column() {
+        let mut app = two_col_model();
+        // row_max = 2 (A,B,C), col 0 → should wrap to (0, 1)
+        app.model.active_view_mut().selected = (2, 0);
+        app.enter_advance();
+        assert_eq!(app.model.active_view().selected, (0, 1));
+    }
+
+    #[test]
+    fn enter_advance_stays_at_bottom_right() {
+        let mut app = two_col_model();
+        app.model.active_view_mut().selected = (2, 1);
+        app.enter_advance();
+        assert_eq!(app.model.active_view().selected, (2, 1));
+    }
+}
diff --git a/src/ui/grid.rs b/src/ui/grid.rs
index 845f6d7..28511b2 100644
--- a/src/ui/grid.rs
+++ b/src/ui/grid.rs
@@ -35,34 +35,53 @@ impl<'a> GridWidget<'a> {
         let col_offset = view.col_offset;
         let (fmt_comma, fmt_decimals) = parse_number_format(&view.number_format);
 
+        let n_col_levels = layout.col_cats.len().max(1);
+        let n_row_levels = layout.row_cats.len().max(1);
+
+        // Sub-column widths for row header area
+        let sub_col_w = ROW_HEADER_WIDTH / n_row_levels as u16;
+        let sub_widths: Vec<u16> = (0..n_row_levels).map(|d| {
+            if d < n_row_levels - 1 { sub_col_w }
+            else { ROW_HEADER_WIDTH.saturating_sub(sub_col_w * (n_row_levels as u16 - 1)) }
+        }).collect();
+
         let available_cols = ((area.width.saturating_sub(ROW_HEADER_WIDTH)) / COL_WIDTH) as usize;
         let visible_col_range = col_offset..(col_offset + available_cols.max(1)).min(layout.col_count());
 
-        let available_rows = area.height.saturating_sub(2) as usize;
+        let header_rows = n_col_levels as u16 + 1; // +1 for separator
+        let available_rows = area.height.saturating_sub(header_rows) as usize;
         let visible_row_range = row_offset..(row_offset + available_rows.max(1)).min(layout.row_count());
 
         let mut y = area.y;
 
-        // Column headers
+        // Column headers — one row per level, with repeat suppression
         let header_style = Style::default().fg(Color::Yellow).add_modifier(Modifier::BOLD);
-        buf.set_string(area.x, y,
-            format!("{:<width$}", "", width = ROW_HEADER_WIDTH as usize),
-            Style::default());
-        let mut x = area.x + ROW_HEADER_WIDTH;
-        for ci in visible_col_range.clone() {
-            let label = layout.col_label(ci);
-            let styled = if ci == sel_col {
-                header_style.add_modifier(Modifier::UNDERLINED)
-            } else {
-                header_style
-            };
-            buf.set_string(x, y,
-                format!("{:>width$}", truncate(&label, COL_WIDTH as usize), width = COL_WIDTH as usize),
-                styled);
-            x += COL_WIDTH;
-            if x >= area.x + area.width { break; }
+        for d in 0..n_col_levels {
+            buf.set_string(area.x, y,
+                format!("{:<width$}", "", width = ROW_HEADER_WIDTH as usize),
+                Style::default());
+            let mut x = area.x + ROW_HEADER_WIDTH;
+            for ci in visible_col_range.clone() {
+                let label = if layout.col_cats.is_empty() {
+                    layout.col_label(ci)
+                } else {
+                    let show = ci == 0
+                        || layout.col_items[ci][..=d] != layout.col_items[ci - 1][..=d];
+                    if show { layout.col_items[ci][d].clone() } else { String::new() }
+                };
+                let styled = if ci == sel_col {
+                    header_style.add_modifier(Modifier::UNDERLINED)
+                } else {
+                    header_style
+                };
+                buf.set_string(x, y,
+                    format!("{:>width$}", truncate(&label, COL_WIDTH as usize), width = COL_WIDTH as usize),
+                    styled);
+                x += COL_WIDTH;
+                if x >= area.x + area.width { break; }
+            }
+            y += 1;
         }
-        y += 1;
 
         // Separator
         buf.set_string(area.x, y,
@@ -74,15 +93,28 @@ impl<'a> GridWidget<'a> {
         for ri in visible_row_range.clone() {
             if y >= area.y + area.height { break; }
 
-            let row_label = layout.row_label(ri);
             let row_style = if ri == sel_row {
                 Style::default().fg(Color::Cyan).add_modifier(Modifier::BOLD)
             } else {
                 Style::default()
             };
-            buf.set_string(area.x, y,
-                format!("{:<width$}", truncate(&row_label, ROW_HEADER_WIDTH as usize - 1), width = ROW_HEADER_WIDTH as usize),
-                row_style);
+
+            // Multi-level row header — one sub-column per row category
+            let mut hx = area.x;
+            for d in 0..n_row_levels {
+                let sw = sub_widths[d] as usize;
+                let label = if layout.row_cats.is_empty() {
+                    layout.row_label(ri)
+                } else {
+                    let show = ri == 0
+                        || layout.row_items[ri][..=d] != layout.row_items[ri - 1][..=d];
+                    if show { layout.row_items[ri][d].clone() } else { String::new() }
+                };
+                buf.set_string(hx, y,
+                    format!("{:<width$}", truncate(&label, sw), width = sw),
+                    row_style);
+                hx += sub_widths[d];
+            }
 
             let mut x = area.x + ROW_HEADER_WIDTH;
             for ci in visible_col_range.clone() {
@@ -446,11 +478,14 @@ mod tests {
         m.active_view_mut().set_axis("Recipient", crate::view::Axis::Row);
 
         let text = buf_text(&render(&m, 80, 24));
-        // Cross-product rows: Food/Alice, Food/Bob, Clothing/Alice, Clothing/Bob
-        assert!(text.contains("Food/Alice"),     "expected 'Food/Alice' in:\n{text}");
-        assert!(text.contains("Food/Bob"),       "expected 'Food/Bob' in:\n{text}");
-        assert!(text.contains("Clothing/Alice"), "expected 'Clothing/Alice' in:\n{text}");
-        assert!(text.contains("Clothing/Bob"),   "expected 'Clothing/Bob' in:\n{text}");
+        // Multi-level row headers: category values shown separately, not joined with /
+        assert!(!text.contains("Food/Alice"),   "slash-joined labels should be gone:\n{text}");
+        assert!(!text.contains("Clothing/Bob"), "slash-joined labels should be gone:\n{text}");
+        // Each item name appears on its own
+        assert!(text.contains("Food"),     "expected 'Food' in:\n{text}");
+        assert!(text.contains("Clothing"), "expected 'Clothing' in:\n{text}");
+        assert!(text.contains("Alice"),    "expected 'Alice' in:\n{text}");
+        assert!(text.contains("Bob"),      "expected 'Bob' in:\n{text}");
     }
 
     #[test]
@@ -484,7 +519,11 @@ mod tests {
         m.active_view_mut().set_axis("Year", crate::view::Axis::Column);
 
         let text = buf_text(&render(&m, 80, 24));
-        assert!(text.contains("Jan/2024"), "expected 'Jan/2024' in:\n{text}");
-        assert!(text.contains("Jan/2025"), "expected 'Jan/2025' in:\n{text}");
+        // Multi-level column headers: category values shown separately, not joined with /
+        assert!(!text.contains("Jan/2024"), "slash-joined headers should be gone:\n{text}");
+        assert!(!text.contains("Jan/2025"), "slash-joined headers should be gone:\n{text}");
+        assert!(text.contains("Jan"),  "expected 'Jan' in:\n{text}");
+        assert!(text.contains("2024"), "expected '2024' in:\n{text}");
+        assert!(text.contains("2025"), "expected '2025' in:\n{text}");
     }
 }